Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4cdaf87d33fbf41cc31cbcf61fe668880374067ba998d1ade8a006826178f8a' 
  AND token = 'SKXgbD3oiCd1Ux1vGh+KWaMjoTopd15YJfcDnUb9LSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}